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You need to provide more information on what you need help with . If you are putting in an after market radio, you can get a wiring harness that will just plug into your radio harness and with the instructions you can wire this yourself. Usually simple. Go to a good parts house for parts and help.

The adapter harness for the radio is probably not wired correctly. I'll bet you also have no tail lights. You probably wired the harness so that the illumination circuit for the factory radio is wired to the wrong terminal of the new radio, thus the problem occuring when you turned on the headlamp switch. I have seen this many times when someone is trying to wire a radio adapter harness without having access to the factory wiring harness diagrams for the vehicle...the wire colors on the adapter harnesses don't allways match the wire colors of the factory harnesses. You need to know which wire is which and wire the correct wires together regardless of what color they may be. If you wired it simply by the wire colors, it most likely is not correct.
If you are lucky, it only blew the fuse for the tail/dash lamps. It is possible that you now have some serious vehicle wiring harness damage caused by the short circuit that was created.
I would disconnect the new radio and get the car fixed first. Then you need to find out which of the wires in the factory harness is for the illumination circuit and make sure that nothing is connected to it on the adapter harness. Most aftermarket radio/stereo systems do not use this circuit at all.

you need a wire harness for your car you can buy them at most auto parts stores make sure and buy the one for your make and model they should have instructions and the wiring diagram most harnesses are color coded and pretty simple to install

they make an adapter wiring harness that allows u to plug the new radio harness into the your factory radio harnness, call these folks at crutchfield.com Call 1-800-319-8264 they will be able to sell u this harness. it is very cheap, about $15.00

Not for sure if I can help.Someone forgot the golden rule.NEVER CUT THE WIRING HARNESS.I dont have the wiring scematics in front of me but the older models had RED for power,BLACK for ground,and the wiring going to the spreakers should be an off color running together going to the speakers.Probably has a six speaker system.Hope I helped.

If installing Toyota radios/CD Players they just plug in regluar sockets in vehicle.
If installing Non-Toyota radios/CD Players youll have to buy a wiring kit from Wal-Mart/Circuit City/etc it would have the wiring diagram in it.